Xbox: Two players Minecraft local

To play locally with two controllers, you need to press the >>> button on the controller and the >>> button on the Xbox at the same time.

It's simple, isn't it? You just need to sync the controller with the button ">>>".
Explanation: Take your controller as if you were playing a FPS (that is, using the triggers) and then, without moving your fingers, turn your controller so you can see your index fingers (the fingers you use to scratch your nose) and then you'll see a tiny button with this sign ">>>". PRESS IT!

You need to start the game normally and enter our world; once inside, just press the blinking button to start the controller. It must have been synchronized with the console beforehand.